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x - 1 = 6 ( x + 2 )
x - 1 = 6x + 12
-1 - 12 = -x + 6x
-13 = 5x
-13 / 5 = x
> 5x = 5. -13/5
= -13
187.000 = x/12 × 3/100 × 5.000.000
187.000 = 12.500x
x = 187.000/12.500
x = 14,96 bulan = 15 bulan (B)
1/6 (x - 1) = x + 2 --> kali 6
1 (x - 1) = 6x + 12
x - 1 = 6x + 12
x - 6x = 12 + 1
-5x = 13
x = 13/-5
x = -2,6
Nilai 5x = 5 (-2,6) = -13 (A)